Two balls of equal mass are projected from a tower simultaneously with equal speeds, one at angle 
above the horizontal and the other at the same angle 
below the horizontal. The path of the centre of mass of the two balls is
A
a vertical straight line
B
a horizontal straight line
C
a straight line at angles 
with horizontal
with horizontal D
a parabola
Text Solution
Verified by ExpertsThe correct answer is:
D
Vertical component of velocity of CM is zero. Horizontal component of velocity of CM is
non-zero. Acceleration of CM is 
downwards, hence path of CM is a parabola as shown in figure.
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